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WorksheetsChemical Equations
Total questions: 21
Worksheet time: 11mins
In a chemical reaction, we use the word reactants for
the substances we start with
the substances we end up with
In the chemical equation shown, the reactants are indicated by
A
B
The reactants in a chemical equation appear
on the left side of the arrow
on the right side of the arrow
In a chemical reaction, we use the word products for
the substances we start with
the substances we end up with
In the chemical equation shown, the products are indicated by
A
B
The products in a chemical equation appear
on the left side of the arrow
on the right side of the arrow
Which of the following is a chemical formula?
A
-->
N2 + 3 H2
NH3
Which of the following is a chemical formula?
H2
3 H2
B
3
The coefficients in this equation are
black
blue
red
green
coefficients tell us
How many of each kind of atom are in a molecule
How many of each kind of molecule are needed in a balanced chemical reaction
which formulas are reactants and which are products
The black letters in this chemical equation are
coefficients
element symbols
subscripts
products
The subscripts in this equation are
black
blue
red
green
subscripts tell us
How many of each kind of atom are in a molecule
How many of each kind of molecule are needed in a balanced chemical reaction
which formulas are reactants and which are products
How many reactants are in this chemical equation?
1
2
3
4
How many products are in this chemical equation?
1
2
3
4
How many hydrogen atoms are in H2?
1
2
3
4
How many hydrogen atoms are in 3 H2?
1
2
3
6
How many nitrogen atoms are in NH3?
1
2
3
6
How many hydrogen atoms are in NH3?
1
2
3
6
How many hydrogen atoms are in 2 NH3?
1
2
3
6
The arrow in a chemical reaction
separates the reactants from the products
represents the change that occurs in a chemical reaction
indicates time passing; points from "before" to "after"
all of these
